Cholera Toxins. Produced by Vibrio cholerae, cholera toxin (CT) is a multimeric enterotoxin that transfers ADP-ribose to a G protein, locking adenylate cyclase in an 'on' position.
echinoderm. n. 1. (Animals) any of the marine invertebrate animals constituting the phylum Echinodermata, characterized by tube feet, a calcite body-covering (test), and a five-part symmetrical body. The group includes the starfish, sea urchins, and sea cucumbers.ny of various invertebrate sea animals having a hard spiny outer covering, an internal skeleton, and a radially symmetrical body. Starfish, sea urchins, and sea cucumbers are echinoderms.
Splendid spines: 'Echinodermata' means 'spiny-skin' in Greek. Most echinoderms have a spiny skin. The spines are most obvious in sea urchins. Brittle stars and some sea stars also have prominent spines along their arms. Sand dollars and most sea stars have tiny spines. Sea cucumbers generally lack hard spines.ost echinoderms have a spiny skin. The spines are most obvious in sea urchins. Brittle stars and some sea stars also have prominent spines along their arms. Sand dollars and most sea stars have tiny spines. Sea cucumbers generally lack hard spines.